/****************************************************** Update of a row (c) 1996 Innobase Oy Created 12/27/1996 Heikki Tuuri *******************************************************/ #include "mtr0log.h" #include "trx0trx.h" #include "trx0undo.h" #include "row0row.h" #include "btr0sea.h" /************************************************************************* Creates an update vector object. */ UNIV_INLINE upd_t* upd_create( /*=======*/ /* out, own: update vector object */ ulint n, /* in: number of fields */ mem_heap_t* heap) /* in: heap from which memory allocated */ { upd_t* update; update = mem_heap_alloc(heap, sizeof(upd_t)); update->info_bits = 0; update->n_fields = n; update->fields = mem_heap_alloc(heap, sizeof(upd_field_t) * n); return(update); } /************************************************************************* Returns the number of fields in the update vector == number of columns to be updated by an update vector. */ UNIV_INLINE ulint upd_get_n_fields( /*=============*/ /* out: number of fields */ upd_t* update) /* in: update vector */ { ut_ad(update); return(update->n_fields); } /************************************************************************* Returns the nth field of an update vector. */ UNIV_INLINE upd_field_t* upd_get_nth_field( /*==============*/ /* out: update vector field */ upd_t* update, /* in: update vector */ ulint n) /* in: field position in update vector */ { ut_ad(update); ut_ad(n < update->n_fields); return(update->fields + n); } /************************************************************************* Sets the clustered index field number to be updated by an update vector field. */ UNIV_INLINE void upd_field_set_field_no( /*===================*/ upd_field_t* upd_field, /* in: update vector field */ ulint field_no, /* in: field number in a clustered index */ dict_index_t* index) /* in: clustered index */ { ut_ad(index->type & DICT_CLUSTERED); upd_field->field_no = field_no; dtype_copy(dfield_get_type(&(upd_field->new_val)), dict_index_get_nth_type(index, field_no)); } /************************************************************************* Updates the trx id and roll ptr field in a clustered index record when a row is updated or marked deleted. */ UNIV_INLINE void row_upd_rec_sys_fields( /*===================*/ rec_t* rec, /* in: record */ dict_index_t* index, /* in: clustered index */ trx_t* trx, /* in: transaction */ dulint roll_ptr)/* in: roll ptr of the undo log record */ { ut_ad(index->type & DICT_CLUSTERED); ut_ad(!buf_block_align(rec)->is_hashed || rw_lock_own(&btr_search_latch, RW_LOCK_EX)); row_set_rec_trx_id(rec, index, trx->id); row_set_rec_roll_ptr(rec, index, roll_ptr); }